1 /* Copyright (c) 2012, The Linux Foundation. All rights reserved.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/types.h>
16 #include <linux/device.h>
18 #include <linux/err.h>
19 #include <linux/export.h>
20 #include <linux/slab.h>
21 #include <linux/mutex.h>
22 #include <linux/clk.h>
23 #include <linux/coresight.h>
24 #include <linux/of_platform.h>
25 #include <linux/delay.h>
26 #include <linux/pm_runtime.h>
28 #include "coresight-priv.h"
30 static DEFINE_MUTEX(coresight_mutex);
33 * struct coresight_node - elements of a path, from source to sink
34 * @csdev: Address of an element.
35 * @link: hook to the list.
37 struct coresight_node {
38 struct coresight_device *csdev;
39 struct list_head link;
43 * When operating Coresight drivers from the sysFS interface, only a single
44 * path can exist from a tracer (associated to a CPU) to a sink.
46 static DEFINE_PER_CPU(struct list_head *, tracer_path);
49 * As of this writing only a single STM can be found in CS topologies. Since
50 * there is no way to know if we'll ever see more and what kind of
51 * configuration they will enact, for the time being only define a single path
54 static struct list_head *stm_path;
57 * When losing synchronisation a new barrier packet needs to be inserted at the
58 * beginning of the data collected in a buffer. That way the decoder knows that
59 * it needs to look for another sync sequence.
61 const u32 barrier_pkt[5] = {0x7fffffff, 0x7fffffff,
62 0x7fffffff, 0x7fffffff, 0x0};
64 static int coresight_id_match(struct device *dev, void *data)
66 int trace_id, i_trace_id;
67 struct coresight_device *csdev, *i_csdev;
70 i_csdev = to_coresight_device(dev);
73 * No need to care about oneself and components that are not
74 * sources or not enabled
76 if (i_csdev == csdev || !i_csdev->enable ||
77 i_csdev->type != CORESIGHT_DEV_TYPE_SOURCE)
80 /* Get the source ID for both compoment */
81 trace_id = source_ops(csdev)->trace_id(csdev);
82 i_trace_id = source_ops(i_csdev)->trace_id(i_csdev);
84 /* All you need is one */
85 if (trace_id == i_trace_id)
91 static int coresight_source_is_unique(struct coresight_device *csdev)
93 int trace_id = source_ops(csdev)->trace_id(csdev);
95 /* this shouldn't happen */
99 return !bus_for_each_dev(&coresight_bustype, NULL,
100 csdev, coresight_id_match);
103 static int coresight_find_link_inport(struct coresight_device *csdev,
104 struct coresight_device *parent)
107 struct coresight_connection *conn;
109 for (i = 0; i < parent->nr_outport; i++) {
110 conn = &parent->conns[i];
111 if (conn->child_dev == csdev)
112 return conn->child_port;
115 dev_err(&csdev->dev, "couldn't find inport, parent: %s, child: %s\n",
116 dev_name(&parent->dev), dev_name(&csdev->dev));
121 static int coresight_find_link_outport(struct coresight_device *csdev,
122 struct coresight_device *child)
125 struct coresight_connection *conn;
127 for (i = 0; i < csdev->nr_outport; i++) {
128 conn = &csdev->conns[i];
129 if (conn->child_dev == child)
130 return conn->outport;
133 dev_err(&csdev->dev, "couldn't find outport, parent: %s, child: %s\n",
134 dev_name(&csdev->dev), dev_name(&child->dev));
139 static int coresight_enable_sink(struct coresight_device *csdev, u32 mode)
144 * We need to make sure the "new" session is compatible with the
145 * existing "mode" of operation.
147 if (sink_ops(csdev)->enable) {
148 ret = sink_ops(csdev)->enable(csdev, mode);
151 csdev->enable = true;
154 atomic_inc(csdev->refcnt);
159 static void coresight_disable_sink(struct coresight_device *csdev)
161 if (atomic_dec_return(csdev->refcnt) == 0) {
162 if (sink_ops(csdev)->disable) {
163 sink_ops(csdev)->disable(csdev);
164 csdev->enable = false;
169 static int coresight_enable_link(struct coresight_device *csdev,
170 struct coresight_device *parent,
171 struct coresight_device *child)
175 int refport, inport, outport;
177 if (!parent || !child)
180 inport = coresight_find_link_inport(csdev, parent);
181 outport = coresight_find_link_outport(csdev, child);
182 link_subtype = csdev->subtype.link_subtype;
184 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
186 else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
194 if (atomic_inc_return(&csdev->refcnt[refport]) == 1) {
195 if (link_ops(csdev)->enable) {
196 ret = link_ops(csdev)->enable(csdev, inport, outport);
202 csdev->enable = true;
207 static void coresight_disable_link(struct coresight_device *csdev,
208 struct coresight_device *parent,
209 struct coresight_device *child)
213 int refport, inport, outport;
215 if (!parent || !child)
218 inport = coresight_find_link_inport(csdev, parent);
219 outport = coresight_find_link_outport(csdev, child);
220 link_subtype = csdev->subtype.link_subtype;
222 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) {
224 nr_conns = csdev->nr_inport;
225 } else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) {
227 nr_conns = csdev->nr_outport;
233 if (atomic_dec_return(&csdev->refcnt[refport]) == 0) {
234 if (link_ops(csdev)->disable)
235 link_ops(csdev)->disable(csdev, inport, outport);
238 for (i = 0; i < nr_conns; i++)
239 if (atomic_read(&csdev->refcnt[i]) != 0)
242 csdev->enable = false;
245 static int coresight_enable_source(struct coresight_device *csdev, u32 mode)
249 if (!coresight_source_is_unique(csdev)) {
250 dev_warn(&csdev->dev, "traceID %d not unique\n",
251 source_ops(csdev)->trace_id(csdev));
255 if (!csdev->enable) {
256 if (source_ops(csdev)->enable) {
257 ret = source_ops(csdev)->enable(csdev, NULL, mode);
261 csdev->enable = true;
264 atomic_inc(csdev->refcnt);
270 * coresight_disable_source - Drop the reference count by 1 and disable
271 * the device if there are no users left.
273 * @csdev - The coresight device to disable
275 * Returns true if the device has been disabled.
277 static bool coresight_disable_source(struct coresight_device *csdev)
279 if (atomic_dec_return(csdev->refcnt) == 0) {
280 if (source_ops(csdev)->disable)
281 source_ops(csdev)->disable(csdev, NULL);
282 csdev->enable = false;
284 return !csdev->enable;
287 void coresight_disable_path(struct list_head *path)
290 struct coresight_node *nd;
291 struct coresight_device *csdev, *parent, *child;
293 list_for_each_entry(nd, path, link) {
298 * ETF devices are tricky... They can be a link or a sink,
299 * depending on how they are configured. If an ETF has been
300 * "activated" it will be configured as a sink, otherwise
301 * go ahead with the link configuration.
303 if (type == CORESIGHT_DEV_TYPE_LINKSINK)
304 type = (csdev == coresight_get_sink(path)) ?
305 CORESIGHT_DEV_TYPE_SINK :
306 CORESIGHT_DEV_TYPE_LINK;
309 case CORESIGHT_DEV_TYPE_SINK:
310 coresight_disable_sink(csdev);
312 case CORESIGHT_DEV_TYPE_SOURCE:
313 /* sources are disabled from either sysFS or Perf */
315 case CORESIGHT_DEV_TYPE_LINK:
316 parent = list_prev_entry(nd, link)->csdev;
317 child = list_next_entry(nd, link)->csdev;
318 coresight_disable_link(csdev, parent, child);
326 int coresight_enable_path(struct list_head *path, u32 mode)
331 struct coresight_node *nd;
332 struct coresight_device *csdev, *parent, *child;
334 list_for_each_entry_reverse(nd, path, link) {
339 * ETF devices are tricky... They can be a link or a sink,
340 * depending on how they are configured. If an ETF has been
341 * "activated" it will be configured as a sink, otherwise
342 * go ahead with the link configuration.
344 if (type == CORESIGHT_DEV_TYPE_LINKSINK)
345 type = (csdev == coresight_get_sink(path)) ?
346 CORESIGHT_DEV_TYPE_SINK :
347 CORESIGHT_DEV_TYPE_LINK;
350 case CORESIGHT_DEV_TYPE_SINK:
351 ret = coresight_enable_sink(csdev, mode);
353 * Sink is the first component turned on. If we
354 * failed to enable the sink, there are no components
355 * that need disabling. Disabling the path here
356 * would mean we could disrupt an existing session.
361 case CORESIGHT_DEV_TYPE_SOURCE:
362 /* sources are enabled from either sysFS or Perf */
364 case CORESIGHT_DEV_TYPE_LINK:
365 parent = list_prev_entry(nd, link)->csdev;
366 child = list_next_entry(nd, link)->csdev;
367 ret = coresight_enable_link(csdev, parent, child);
379 coresight_disable_path(path);
383 struct coresight_device *coresight_get_sink(struct list_head *path)
385 struct coresight_device *csdev;
390 csdev = list_last_entry(path, struct coresight_node, link)->csdev;
391 if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
392 csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
398 static int coresight_enabled_sink(struct device *dev, void *data)
401 struct coresight_device *csdev = to_coresight_device(dev);
403 if ((csdev->type == CORESIGHT_DEV_TYPE_SINK ||
404 csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) &&
407 * Now that we have a handle on the sink for this session,
408 * disable the sysFS "enable_sink" flag so that possible
409 * concurrent perf session that wish to use another sink don't
410 * trip on it. Doing so has no ramification for the current
414 csdev->activated = false;
423 * coresight_get_enabled_sink - returns the first enabled sink found on the bus
424 * @deactivate: Whether the 'enable_sink' flag should be reset
426 * When operated from perf the deactivate parameter should be set to 'true'.
427 * That way the "enabled_sink" flag of the sink that was selected can be reset,
428 * allowing for other concurrent perf sessions to choose a different sink.
430 * When operated from sysFS users have full control and as such the deactivate
431 * parameter should be set to 'false', hence mandating users to explicitly
434 struct coresight_device *coresight_get_enabled_sink(bool deactivate)
436 struct device *dev = NULL;
438 dev = bus_find_device(&coresight_bustype, NULL, &deactivate,
439 coresight_enabled_sink);
441 return dev ? to_coresight_device(dev) : NULL;
445 * _coresight_build_path - recursively build a path from a @csdev to a sink.
446 * @csdev: The device to start from.
447 * @path: The list to add devices to.
449 * The tree of Coresight device is traversed until an activated sink is
450 * found. From there the sink is added to the list along with all the
451 * devices that led to that point - the end result is a list from source
452 * to sink. In that list the source is the first device and the sink the
455 static int _coresight_build_path(struct coresight_device *csdev,
456 struct coresight_device *sink,
457 struct list_head *path)
461 struct coresight_node *node;
463 /* An activated sink has been found. Enqueue the element */
467 /* Not a sink - recursively explore each port found on this element */
468 for (i = 0; i < csdev->nr_outport; i++) {
469 struct coresight_device *child_dev = csdev->conns[i].child_dev;
472 _coresight_build_path(child_dev, sink, path) == 0) {
483 * A path from this element to a sink has been found. The elements
484 * leading to the sink are already enqueued, all that is left to do
485 * is tell the PM runtime core we need this element and add a node
488 node = kzalloc(sizeof(struct coresight_node), GFP_KERNEL);
493 list_add(&node->link, path);
494 pm_runtime_get_sync(csdev->dev.parent);
499 struct list_head *coresight_build_path(struct coresight_device *source,
500 struct coresight_device *sink)
502 struct list_head *path;
506 return ERR_PTR(-EINVAL);
508 path = kzalloc(sizeof(struct list_head), GFP_KERNEL);
510 return ERR_PTR(-ENOMEM);
512 INIT_LIST_HEAD(path);
514 rc = _coresight_build_path(source, sink, path);
524 * coresight_release_path - release a previously built path.
525 * @path: the path to release.
527 * Go through all the elements of a path and 1) removed it from the list and
528 * 2) free the memory allocated for each node.
530 void coresight_release_path(struct list_head *path)
532 struct coresight_device *csdev;
533 struct coresight_node *nd, *next;
535 list_for_each_entry_safe(nd, next, path, link) {
538 pm_runtime_put_sync(csdev->dev.parent);
547 /** coresight_validate_source - make sure a source has the right credentials
548 * @csdev: the device structure for a source.
549 * @function: the function this was called from.
551 * Assumes the coresight_mutex is held.
553 static int coresight_validate_source(struct coresight_device *csdev,
554 const char *function)
559 subtype = csdev->subtype.source_subtype;
561 if (type != CORESIGHT_DEV_TYPE_SOURCE) {
562 dev_err(&csdev->dev, "wrong device type in %s\n", function);
566 if (subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_PROC &&
567 subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE) {
568 dev_err(&csdev->dev, "wrong device subtype in %s\n", function);
575 int coresight_enable(struct coresight_device *csdev)
578 struct coresight_device *sink;
579 struct list_head *path;
580 enum coresight_dev_subtype_source subtype;
582 subtype = csdev->subtype.source_subtype;
584 mutex_lock(&coresight_mutex);
586 ret = coresight_validate_source(csdev, __func__);
592 * There could be multiple applications driving the software
593 * source. So keep the refcount for each such user when the
594 * source is already enabled.
596 if (subtype == CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE)
597 atomic_inc(csdev->refcnt);
602 * Search for a valid sink for this session but don't reset the
603 * "enable_sink" flag in sysFS. Users get to do that explicitly.
605 sink = coresight_get_enabled_sink(false);
611 path = coresight_build_path(csdev, sink);
613 pr_err("building path(s) failed\n");
618 ret = coresight_enable_path(path, CS_MODE_SYSFS);
622 ret = coresight_enable_source(csdev, CS_MODE_SYSFS);
627 case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC:
629 * When working from sysFS it is important to keep track
630 * of the paths that were created so that they can be
631 * undone in 'coresight_disable()'. Since there can only
632 * be a single session per tracer (when working from sysFS)
633 * a per-cpu variable will do just fine.
635 cpu = source_ops(csdev)->cpu_id(csdev);
636 per_cpu(tracer_path, cpu) = path;
638 case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
642 /* We can't be here */
647 mutex_unlock(&coresight_mutex);
651 coresight_disable_path(path);
654 coresight_release_path(path);
657 EXPORT_SYMBOL_GPL(coresight_enable);
659 void coresight_disable(struct coresight_device *csdev)
662 struct list_head *path = NULL;
664 mutex_lock(&coresight_mutex);
666 ret = coresight_validate_source(csdev, __func__);
670 if (!csdev->enable || !coresight_disable_source(csdev))
673 switch (csdev->subtype.source_subtype) {
674 case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC:
675 cpu = source_ops(csdev)->cpu_id(csdev);
676 path = per_cpu(tracer_path, cpu);
677 per_cpu(tracer_path, cpu) = NULL;
679 case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
684 /* We can't be here */
688 coresight_disable_path(path);
689 coresight_release_path(path);
692 mutex_unlock(&coresight_mutex);
694 EXPORT_SYMBOL_GPL(coresight_disable);
696 static ssize_t enable_sink_show(struct device *dev,
697 struct device_attribute *attr, char *buf)
699 struct coresight_device *csdev = to_coresight_device(dev);
701 return scnprintf(buf, PAGE_SIZE, "%u\n", csdev->activated);
704 static ssize_t enable_sink_store(struct device *dev,
705 struct device_attribute *attr,
706 const char *buf, size_t size)
710 struct coresight_device *csdev = to_coresight_device(dev);
712 ret = kstrtoul(buf, 10, &val);
717 csdev->activated = true;
719 csdev->activated = false;
724 static DEVICE_ATTR_RW(enable_sink);
726 static ssize_t enable_source_show(struct device *dev,
727 struct device_attribute *attr, char *buf)
729 struct coresight_device *csdev = to_coresight_device(dev);
731 return scnprintf(buf, PAGE_SIZE, "%u\n", csdev->enable);
734 static ssize_t enable_source_store(struct device *dev,
735 struct device_attribute *attr,
736 const char *buf, size_t size)
740 struct coresight_device *csdev = to_coresight_device(dev);
742 ret = kstrtoul(buf, 10, &val);
747 ret = coresight_enable(csdev);
751 coresight_disable(csdev);
756 static DEVICE_ATTR_RW(enable_source);
758 static struct attribute *coresight_sink_attrs[] = {
759 &dev_attr_enable_sink.attr,
762 ATTRIBUTE_GROUPS(coresight_sink);
764 static struct attribute *coresight_source_attrs[] = {
765 &dev_attr_enable_source.attr,
768 ATTRIBUTE_GROUPS(coresight_source);
770 static struct device_type coresight_dev_type[] = {
776 .groups = coresight_sink_groups,
783 .groups = coresight_sink_groups,
787 .groups = coresight_source_groups,
791 static void coresight_device_release(struct device *dev)
793 struct coresight_device *csdev = to_coresight_device(dev);
796 kfree(csdev->refcnt);
800 static int coresight_orphan_match(struct device *dev, void *data)
803 bool still_orphan = false;
804 struct coresight_device *csdev, *i_csdev;
805 struct coresight_connection *conn;
808 i_csdev = to_coresight_device(dev);
810 /* No need to check oneself */
811 if (csdev == i_csdev)
814 /* Move on to another component if no connection is orphan */
815 if (!i_csdev->orphan)
818 * Circle throuch all the connection of that component. If we find
819 * an orphan connection whose name matches @csdev, link it.
821 for (i = 0; i < i_csdev->nr_outport; i++) {
822 conn = &i_csdev->conns[i];
824 /* We have found at least one orphan connection */
825 if (conn->child_dev == NULL) {
826 /* Does it match this newly added device? */
827 if (conn->child_name &&
828 !strcmp(dev_name(&csdev->dev), conn->child_name)) {
829 conn->child_dev = csdev;
831 /* This component still has an orphan */
837 i_csdev->orphan = still_orphan;
840 * Returning '0' ensures that all known component on the
841 * bus will be checked.
846 static void coresight_fixup_orphan_conns(struct coresight_device *csdev)
849 * No need to check for a return value as orphan connection(s)
850 * are hooked-up with each newly added component.
852 bus_for_each_dev(&coresight_bustype, NULL,
853 csdev, coresight_orphan_match);
857 static int coresight_name_match(struct device *dev, void *data)
860 struct coresight_device *i_csdev;
863 i_csdev = to_coresight_device(dev);
865 if (to_match && !strcmp(to_match, dev_name(&i_csdev->dev)))
871 static void coresight_fixup_device_conns(struct coresight_device *csdev)
874 struct device *dev = NULL;
875 struct coresight_connection *conn;
877 for (i = 0; i < csdev->nr_outport; i++) {
878 conn = &csdev->conns[i];
879 dev = bus_find_device(&coresight_bustype, NULL,
880 (void *)conn->child_name,
881 coresight_name_match);
884 conn->child_dev = to_coresight_device(dev);
885 /* and put reference from 'bus_find_device()' */
888 csdev->orphan = true;
889 conn->child_dev = NULL;
894 static int coresight_remove_match(struct device *dev, void *data)
897 struct coresight_device *csdev, *iterator;
898 struct coresight_connection *conn;
901 iterator = to_coresight_device(dev);
903 /* No need to check oneself */
904 if (csdev == iterator)
908 * Circle throuch all the connection of that component. If we find
909 * a connection whose name matches @csdev, remove it.
911 for (i = 0; i < iterator->nr_outport; i++) {
912 conn = &iterator->conns[i];
914 if (conn->child_dev == NULL)
917 if (!strcmp(dev_name(&csdev->dev), conn->child_name)) {
918 iterator->orphan = true;
919 conn->child_dev = NULL;
920 /* No need to continue */
926 * Returning '0' ensures that all known component on the
927 * bus will be checked.
932 static void coresight_remove_conns(struct coresight_device *csdev)
934 bus_for_each_dev(&coresight_bustype, NULL,
935 csdev, coresight_remove_match);
939 * coresight_timeout - loop until a bit has changed to a specific state.
940 * @addr: base address of the area of interest.
941 * @offset: address of a register, starting from @addr.
942 * @position: the position of the bit of interest.
943 * @value: the value the bit should have.
945 * Return: 0 as soon as the bit has taken the desired state or -EAGAIN if
946 * TIMEOUT_US has elapsed, which ever happens first.
949 int coresight_timeout(void __iomem *addr, u32 offset, int position, int value)
954 for (i = TIMEOUT_US; i > 0; i--) {
955 val = __raw_readl(addr + offset);
956 /* waiting on the bit to go from 0 to 1 */
958 if (val & BIT(position))
960 /* waiting on the bit to go from 1 to 0 */
962 if (!(val & BIT(position)))
967 * Delay is arbitrary - the specification doesn't say how long
968 * we are expected to wait. Extra check required to make sure
969 * we don't wait needlessly on the last iteration.
978 struct bus_type coresight_bustype = {
982 static int __init coresight_init(void)
984 return bus_register(&coresight_bustype);
986 postcore_initcall(coresight_init);
988 struct coresight_device *coresight_register(struct coresight_desc *desc)
994 atomic_t *refcnts = NULL;
995 struct coresight_device *csdev;
996 struct coresight_connection *conns = NULL;
998 csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
1001 goto err_kzalloc_csdev;
1004 if (desc->type == CORESIGHT_DEV_TYPE_LINK ||
1005 desc->type == CORESIGHT_DEV_TYPE_LINKSINK) {
1006 link_subtype = desc->subtype.link_subtype;
1008 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
1009 nr_refcnts = desc->pdata->nr_inport;
1010 else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
1011 nr_refcnts = desc->pdata->nr_outport;
1014 refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL);
1017 goto err_kzalloc_refcnts;
1020 csdev->refcnt = refcnts;
1022 csdev->nr_inport = desc->pdata->nr_inport;
1023 csdev->nr_outport = desc->pdata->nr_outport;
1025 /* Initialise connections if there is at least one outport */
1026 if (csdev->nr_outport) {
1027 conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL);
1030 goto err_kzalloc_conns;
1033 for (i = 0; i < csdev->nr_outport; i++) {
1034 conns[i].outport = desc->pdata->outports[i];
1035 conns[i].child_name = desc->pdata->child_names[i];
1036 conns[i].child_port = desc->pdata->child_ports[i];
1040 csdev->conns = conns;
1042 csdev->type = desc->type;
1043 csdev->subtype = desc->subtype;
1044 csdev->ops = desc->ops;
1045 csdev->orphan = false;
1047 csdev->dev.type = &coresight_dev_type[desc->type];
1048 csdev->dev.groups = desc->groups;
1049 csdev->dev.parent = desc->dev;
1050 csdev->dev.release = coresight_device_release;
1051 csdev->dev.bus = &coresight_bustype;
1052 dev_set_name(&csdev->dev, "%s", desc->pdata->name);
1054 ret = device_register(&csdev->dev);
1056 goto err_device_register;
1058 mutex_lock(&coresight_mutex);
1060 coresight_fixup_device_conns(csdev);
1061 coresight_fixup_orphan_conns(csdev);
1063 mutex_unlock(&coresight_mutex);
1067 err_device_register:
1071 err_kzalloc_refcnts:
1074 return ERR_PTR(ret);
1076 EXPORT_SYMBOL_GPL(coresight_register);
1078 void coresight_unregister(struct coresight_device *csdev)
1080 /* Remove references of that device in the topology */
1081 coresight_remove_conns(csdev);
1082 device_unregister(&csdev->dev);
1084 EXPORT_SYMBOL_GPL(coresight_unregister);